23.11.13

Relay Control Board on DP5031 PCB

Electromechanical relays are generally employ small signals to switch much higher voltages and currents. As a result, a nice big gap is required to insulate between the signal and load sides. It's often a good idea to hive relays off to a separate board.

This breakout board is released under Creative Commons Attribution Share-Alike 3.0 License, the schematic and parts of the layout derive from Sparkfun Electronics COM-11041 designed by N. Seidle and Joel Bartlett.

The component values are designed for VCC = 5 VDC. For VCC = 12 VDC, use R4 = 3.3 KΩ.

Safety

Mains electricity can kill. If switching high voltages, make sure to mount this PCB in a well-insulated or grounded enclosure. Use conformal coating to insulate the high voltage traces and components and to protect against environmental damage. Make sure your loads are properly protected by fuses.